gnu: rottlog: Apply patch adding a Texinfo direntry.

Relates to <https://issues.guix.gnu.org/58821>.

* gnu/packages/patches/rottlog-direntry.patch: Add patch.
* gnu/packages/admin.scm (rottlog): Apply it.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -1795,10 +1795,11 @@ dist_patch_DATA =						\
   %D%/packages/patches/rnp-add-version.cmake.patch		\
   %D%/packages/patches/rnp-disable-ruby-rnp-tests.patch		\
   %D%/packages/patches/rnp-unbundle-googletest.patch		\
-  %D%/packages/patches/rocm-comgr-3.1.0-dependencies.patch \
-  %D%/packages/patches/rocm-opencl-runtime-4.3-noclinfo.patch \
-  %D%/packages/patches/rocm-opencl-runtime-4.3-noopencl.patch \
-  %D%/packages/patches/ruby-hydra-minimal-no-byebug.patch		\
+  %D%/packages/patches/rocm-comgr-3.1.0-dependencies.patch 	\
+  %D%/packages/patches/rocm-opencl-runtime-4.3-noclinfo.patch 	\
+  %D%/packages/patches/rocm-opencl-runtime-4.3-noopencl.patch 	\
+  %D%/packages/patches/rottlog-direntry.patch 			\
+  %D%/packages/patches/ruby-hydra-minimal-no-byebug.patch	\
   %D%/packages/patches/ruby-anystyle-data-immutable-install.patch	\
   %D%/packages/patches/ruby-anystyle-fix-dictionary-populate.patch	\
   %D%/packages/patches/ruby-latex-decode-fix-test.patch		\

gnu/packages/admin.scm

@@ -1823,6 +1823,7 @@ at once based on a Perl regular expression.")
                (base32
                 "0751mb9l2f0jrk3vj6q8ilanifd121dliwk0c34g8k0dlzsv3kd7"))
               (modules '((guix build utils)))
+              (patches (search-patches "rottlog-direntry.patch"))
               (snippet
                '(begin
                   ;; Delete outdated Autotools build system files.

gnu/packages/patches/rottlog-direntry.patch

@@ -0,0 +1,18 @@
+Add a direntry to the Rottlog info manual.
+
+diff --git a/doc/rottlog.texi b/doc/rottlog.texi
+index 0ba8019..0f29916 100644
+--- a/doc/rottlog.texi
++++ b/doc/rottlog.texi
+@@ -18,6 +18,11 @@ Documentation License.''
+ @end quotation
+ @end copying
+ 
++@dircategory System administration
++@direntry
++* Rottlog: (rottlog).         The GNU log management utility.
++@end direntry
++
+ @paragraphindent none
+ 
+ @iftex